Allo BOSS - GPIO button problem

Hello, i tried it a few times but i cannot get the GPIO Plugin working. I have a Raspi 4 + Allo boss. (without the Allo Volt)
I tried to use the J19 pinheader GPIO 17 & GPIO 27 with my Pushbutton closing to GND with no reaktion.
I tried also GPIO 26 directly from the Raspi to GND also with no success - no reaktion.
The Plugin is endabled, GPIO pin numbers are right. I triple checked everything, tried a few times and researched a lot. I cannot get it working. What is my problem here? I just want to add a shutdown button, with this heavy electricity prices here in Austria these days. Thanks so much Christian

Did I look over something? Nobody has an idea? thanks Christian

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